90Sr, 137Cs leaching behavior in solidified cement product of radioactive waste

Columniform cement solidified product is maken by adding to indicator of 90Sr and 137Cs. Under the respectively constant temperature condition of 25,40,70 degree C, the long-time leaching rates have been measured with the locale's water as the leaching liquid, which is according to GB7023-86. The conclusion shows that the leaching rates of 90Sr and 137Cs in alkali-slay cement are 10-102 times higher than that in No. 525 cement. The leaching rates in 70 degree C are more higher than that in the normal temperature, so the temperature is a very important factor to influence leaching rate. The conductance of leaching water is constantly reduced with the time pas- ting. The alkali-slay cement has better performance in holding back nuclide than the No. 525 cement that is used widely. So we predict this material will be a new type radioactive waste solidified material, and be used widely. (authors)